Messages in this thread | | | Date | Fri, 27 Jul 2012 19:45:02 +0900 | From | Yasuaki Ishimatsu <> | Subject | Re: [RFC PATCH v5 19/19] memory-hotplug: remove sysfs file of node |
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Hi Wen,
2012/07/27 19:36, Wen Congyang wrote: > From: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> > > The patch adds node_set_offline() and unregister_one_node() to remove_memory() > for removing sysfs file of node. > > CC: David Rientjes <rientjes@google.com> > CC: Jiang Liu <liuj97@gmail.com> > CC: Len Brown <len.brown@intel.com> > CC: Benjamin Herrenschmidt <benh@kernel.crashing.org> > CC: Paul Mackerras <paulus@samba.org> > CC: Christoph Lameter <cl@linux.com> > Cc: Minchan Kim <minchan.kim@gmail.com> > CC: Andrew Morton <akpm@linux-foundation.org> > CC: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> > CC: Wen Congyang <wency@cn.fujitsu.com> > Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> > --- > mm/memory_hotplug.c | 5 +++++ > 1 files changed, 5 insertions(+), 0 deletions(-) > > diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c > index 5ac035f..5681968 100644 > --- a/mm/memory_hotplug.c > +++ b/mm/memory_hotplug.c > @@ -1267,6 +1267,11 @@ int __ref remove_memory(int nid, u64 start, u64 size) > /* remove memmap entry */ > firmware_map_remove(start, start + size, "System RAM"); > > + if (!node_present_pages(nid)) {
Applying [PATCH v5 17/19], pgdat->node_spanned_pages can become 0 when all memory of the pgdat is removed. When pgdat->node_spanned_pages is 0, it means the pgdat has no memory. So I think node_spanned_pages() is better.
Thanks, Yasuaki Ishimatsu
> + node_set_offline(nid); > + unregister_one_node(nid); > + } > + > arch_remove_memory(start, size); > out: > unlock_memory_hotplug(); >
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